Rendering improvements

- Improve performance for unbatched rendering
- Support direct texture access

src/render/vitagxm/SDL_render_vita_gxm.c

@@ -148,9 +148,7 @@ void
 StartDrawing(SDL_Renderer *renderer)
 {
     VITA_GXM_RenderData *data = (VITA_GXM_RenderData *) renderer->driverdata;
-    if(data->drawing)
-    {
-        SDL_LogError(SDL_LOG_CATEGORY_RENDER, "uh-oh, already drawing\n");
+    if (data->drawing) {
         return;
     }
 
@@ -993,9 +991,6 @@ VITA_GXM_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *
         cmd = cmd->next;
     }
 
-    sceGxmEndScene(data->gxm_context, NULL, NULL);
-    data->drawing = SDL_FALSE;
-
     return 0;
 }
 
@@ -1091,6 +1086,11 @@ VITA_GXM_RenderPresent(SDL_Renderer *renderer)
     VITA_GXM_RenderData *data = (VITA_GXM_RenderData *) renderer->driverdata;
     SceCommonDialogUpdateParam updateParam;
 
+    if(data->drawing) {
+        sceGxmEndScene(data->gxm_context, NULL, NULL);
+        sceGxmFinish(data->gxm_context);
+    }
+
     data->displayData.address = data->displayBufferData[data->backBufferIndex];
 
     SDL_memset(&updateParam, 0, sizeof(updateParam));